2005 CAT Freightliner check engine light

About a month ago traveling on I-10 from California to Mesa, AZ, my Check Engine came on several times for a few seconds. The engine went into the "safe mode" and speed would start to decrease. Then regain power. All gauges showed normal.
I stopped at the Freightliner Shop in Chandler, AZ. They hooked it up to the computer and ran tests for almost an hour. Then road tested it for several miles on the freeway. After all this, the shop foreman informed me that everything showed normal. Scratched his head and sent me on my way.
$139.00 minus my Freightliner Club discount.
Cat 3126 with 66,000 miles

Most charge around $125.00 per hour.

Thanks Moparmaga2. Very informative post. Do you have any idea what a CAT shop would charge to read the codes? It doesn't apply to me of course, but I'm just interested.

He is simply informing. There is a engine-trans info panel that displays some info but it's fairly useless. I have the dealer password for it but you need a list of the error codes.

The other thing I remember is that the hard stop was also going down a hill so fluids may have sloshed more than usual.

Well exxcccuuuussssseeeee meeee!

To the fifth wheel owner and the Gasoline motorhome owner:

Diesel RV's (At least the medium/ large Cummins/Cat/Detroits) don't have OBDII ports. They have proprietary Manufacturer diagnostic ports and proprietary manufacturer diagnostic software in order to read the ports.

The light duty Cummins 6.7 that some diesel RVs use may have an OBDII port due to being used in Dodge Ram pickups.

My RV has a Caterpillar diagnostic port. This diagnostic port takes a special diagnostic port to serial converter that plugs into a Diesel Mechanics laptop.

Even if you were somehow able to acquire this converter, you still need a software called Cat ET in order to read the information and/or program computer.

This software costs many thousands of dollars. There are some third party softwares like "scanguage for diesels" but reviews are generally poor and they mostly are just useful for displaying info like Transmission temps, etc.

Once a light has come on the computer stores the code umtil someone clears it. Simple version. With an OBD device you can pull up the code and clear it. Look code up to see what problem was. Correct problem. If you had to start vehicle in between, re-clear code.
OBD Devices are bout $150 for good one without going overboard. Good imvestment if you are a DIY guy.

When it flashes, does it store a code you can read with an OBD device?